From: Justin Pryzby <pryzby@telsasoft.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Peter Geoghegan <pg@bowt.ie>
Cc: postgresql@taljaren.se, pgsql-hackers@lists.postgresql.org, Michael Paquier <michael@paquier.xyz>
Subject: Re: BUG #17717: Regression in vacuumdb (15 is slower than 10/11 and possible memory issue)
Date: Wed, 28 Dec 2022 19:23:54 -0600
Message-ID: <20221229012354.GF1153@telsasoft.com> (raw)
In-Reply-To: <407579.1672258403@sss.pgh.pa.us>
References: <17717-6c50eb1c7d23a886@postgresql.org>
<3439037.1671130590@sss.pgh.pa.us>
<CAH2-Wzne4Wgaaruq-VSY2qWNhxcPRqWUbdwVQPkM81TpaHY_kQ@mail.gmail.com>
<3544447.1671141436@sss.pgh.pa.us>
<CAH2-WzkXmYt-K+pQqMqjFgwU7jiykD3amngd5-jkqQF=gST7Og@mail.gmail.com>
<3672943.1671202149@sss.pgh.pa.us>
<CAH2-WzkHRxcE-0Mub9N0Rr09SGEEF1Ex4pUbcOBSRoNGNVy93w@mail.gmail.com>
<407579.1672258403@sss.pgh.pa.us>
On Wed, Dec 28, 2022 at 03:13:23PM -0500, Tom Lane wrote:
> Peter Geoghegan <pg@bowt.ie> writes:
> > On Fri, Dec 16, 2022 at 6:49 AM Tom Lane <tgl@sss.pgh.pa.us> wrote:
> >> That is a really good point. How about teaching VACUUM to track
> >> the oldest original relfrozenxid and relminmxid among the table(s)
> >> it processed, and skip vac_update_datfrozenxid unless at least one
> >> of those matches the database's values? For extra credit, also
> >> skip if we didn't successfully advance the source rel's value.
>
> > Hmm. I think that that would probably work.
>
> I'm forced to the conclusion that we have to expose some VACUUM
> options if we want this to work well. Attached is a draft patch
> that invents SKIP_DATABASE_STATS and ONLY_DATABASE_STATS options
> (name bikeshedding welcome) and teaches vacuumdb to use them.
I was surprised to hear that this added *two* options.
I assumed it would look like:
VACUUM (UPDATE_DATABASE_STATS {yes,no,only})
--
Justin
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To: pgsql-bugs@postgresql.org
Cc: pryzby@telsasoft.com, tgl@sss.pgh.pa.us, pg@bowt.ie, michael@paquier.xyz
Subject: Re: BUG #17717: Regression in vacuumdb (15 is slower than 10/11 and possible memory issue)
In-Reply-To: <20221229012354.GF1153@telsasoft.com>
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